Dating Scan in Pregnancy – What to Expect

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How accurate is your baby’s due date? What to know about when you’ll go into labor

Read terms. Pettker, MD; James D. Goldberg, MD; and Yasser Y. This document reflects emerging clinical and scientific advances as of the date issued and is subject to change.

If you had irregular periods, your due date calculation based on your last menstrual cycle is often not accurate. If this is your situation, the dates of the scan will be.

Pregnancy math can be a little murky. After all, unless you went the IVF route, your physician has no way of knowing the exact time of conception. Because of this, pregnancy is calculated from the first day of your last menstrual period or LMP. From that day, weeks of pregnancy is officially counted, and your doc or midwife busts out the red pen and marks your due date on the calendar. Sometimes, however, the due date may be revised.

It can be pretty difficult to determine a due date using the date-of-last-period method for women with irregular cycles — which is why an ultrasound exam is often required to determine gestational age. An early ultrasound, usually done at about 6 to 9 weeks, can give the most accurate due date estimation by measuring the size of the embryo or fetus. However, many pregnancies are confirmed by a Doppler heartbeat monitor, not an ultrasound.

Did you get your very first ultrasound in your second trimester? If so, that could be why your due date shifted. Ultrasounds performed during the first trimester not the second give the most accurate due date predictions, according to a study in the American Journal of Obstetrics and Gynecology.

Obstetric Ultrasound

Nuchal translucency is a measurement of fluid behind the baby’s neck that is present in all babies during the first trimester of pregnancy. Our staff are specially trained and audited through the Fetal Medicine Foundation to undertake this examination using very specific guidelines. Fortunately, these defects are rare.

Growth scans allow us track how your baby is growing. Specialised scans can evaluate your risk of having a baby that is small. There are several reasons why you may be referred for a tertiary level scan.

Ultrasound examination in the first trimester allows accurate to assess the gestational age of the baby (when the conception date is not.

Expectant first-time mothers have all sorts of questions running through their heads. As the baby develops, the mother wonders about its health, if she will be a good mother, what the future will hold for the family, and if they will be one and done or have a big family. Medical professionals and doctors can only answer so much. What they can do is monitor the health and development of the baby and make educated predictions about the future.

One of the best tools at their disposal is the ultrasound machine. Prenatal care is the treatment most often associated with ultrasound machines.

Methods for Estimating the Due Date

An ultrasound scan sonogram uses sound waves that bounce off solid objects to create two-dimensional black and white images on a screen. It’s completely safe for you and your baby. It also isn’t completely reliable.

How accurate are dating scans? During your dating scan your baby is carefully measured. These.

Unless this is required urgently, a letter will be sent to you in the post with the date and time of your scan. Please allow about an hour for this appointment, as after your scan a midwife will need to talk to you about other appointments you may require, blood test results and screening tests. Your anomaly scan also known as your 20 week scan.

At your 1st trimester scan, an appointment will be made for your anomaly scan. During this scan, the sonographer will have a detailed look at your baby. This is part of the fetal anomaly screening programme FASP. For more information about the anomaly screening programme click here. Please note this scan is not a sexing scan. Criteria for these scans varies but includes having a previously small for dates baby, being a smoker or having a BMI above These scans are usually held from 28 weeks, and every weeks thereafter to keep an eye on the growth of your baby until delivery.

Growth scans can also be requested by your community midwife. If you’d like to know more about the GROW programme, please see the link to the right of the page. Presentation Scans. Our service also covers scans requested by the doctors e.

Ultrasound scanning in pregnancy

Get the earliest confirmation of dates from 8 weeks using measurements of the baby. For added peace of mind during your pregnancy, our reassurance scan is from 12 weeks. Our firstScan clinics offer a range of specialist early scans , such as IVF, reccurent miscarriage, previous ectopic and more. At the heart of all our scans is the well-being of Mum and Baby from as early as 6 weeks two weeks after your first positive pregnancy test.

All packages are designed to suit individual pregnancy requirements built with Mum in mind.

It will give you a more accurate idea of when baby is due, usually it’s not as far advanced as the date of your last period suggests. Your sonographer will check that.

Name the time in gestation when ultrasound is most accurate 2. Discuss the ACOG recommendations for redating a pregnancy based on trimester. Postgraduate Institute for Medicine PIM requires instructors, planners, managers and other individuals who are in a position to control the content of this activity to disclose any real or apparent conflict of interest COI they may have as related to the content of this activity.

PIM is committed to providing its learners with high quality CME activities and related materials that promote improvements or quality in healthcare and not a specific proprietary business interest of a commercial interest. Faculty: Susan J. During the period from Dec 31 through Dec 31 , participants must read the learning objectives and faculty disclosures and study the educational activity. If you wish to receive acknowledgment for completing this activity, please complete the post-test and evaluation.

In support of improving patient care, this activity has been planned and implemented by the Postgraduate Institute for Medicine and The ObG Project.

When LMP and Ultrasound Dates Don’t Match: When to Redate?

Your first pregnancy ultrasound can happen between 8 and 14 weeks and is also known as the dating scan. You may well be full of mixed emotions, so having your partner or friend to share the moment could be a good idea. For most mums the 12 week scan will be their first baby scan and it can happen anytime between 8 and 14 weeks and is also known as the dating scan. Your sonographer will check that the heart is beating nicely and baby is growing normally.

First trimester ultrasound is the most accurate time frame for pregnancy dating and can increase the accuracy of the EDD even if LMP is known.

If you were having regular periods before pregnancy, your doctor will calculate your due date based off of your last menstrual period. This goes back to the fact that in order to get pregnant, your body ovulated—or released an egg—roughly in the middle of your cycle and it was fertilized by sperm. That was the moment of conception. Is an ultrasound a more accurate way of finding out my due date?

If you are having irregular cycles before getting pregnant, an ultrasound is usually done to find out how far along you are. An ultrasound is actually the most accurate way to date a pregnancy because all fetuses grow at a consistent rate during the first trimester and early second. Your doctor will go with the due date obtained from your ultrasound. What happens if my baby is measuring big or small later on? Does my due date need to change or will I deliver early?

That measurement should match your gestational age in centimeters. If you are measuring smaller or larger than what you should be, then the doctor might order an ultrasound. If the baby is actually smaller or larger than what they should be, underlying issues need to be considered that might be causing the discrepancy in growth.

Which screening tests are performed during pregnancy? – Dr. Anitha Prasad


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